Improvement in exhaust-nozzles for steam-cylinders



G. sEwELL. A'Exhaust-Noz'zlgs for Steam-I'Iylilflclerss.v No.l57,230. PatemedNpv.24,174.

TH! GRAPHIC C0. PgiOTG-LITH398x4-l PARK PLACE,N,Y.

UNITED STATES PATENT OEEIcEo GEORGE SEYVELL, OF BROOKLYN, NEW YORK.

IMPROVEMENT IN EXHAUST-NOZZLES FOR STEAM-CYLINDERS.

Specification forming part of Letters Patent No. 157,230, dated November 24, 1874; application led November 7, 1874.

CASE A.

To all whom t may concern:

Be it known that I, GEORGE SEWELL, of Brooklyn, in the county of Kings and State of New York, have invented certain new and useful Improvements in Exhaust-Nozzles for Steam-Cylinders; and I do hereby declare that the following is a full, clear, and exact description of the same, reference being had to the accompanying drawing, forming part of this specication.

My invention relates to certain improvements whereby the engineer of a locomotive is enabled to vary at pleasure the dimensions of the delivery or exhaust nozzles, and thus control the action or velocity of the exhaust steam in its escape into the smoke-stack, and thereby regulate the steamgenerating capacity of the boiler, and at the same time regulate the back pressure on the steam-pistons of the engine.

The invention consists in a divided nozzle of novel construction applied to the end of the exhaust-pipe, and the combination therewith of connecting-links, cross-heads, and levers for varying the dimensions of the nozzle, and regulating the velocity of the exhaust steam escaping therethrough.

In the accompanying drawing, Figure lis an end view of my improved nozzle. Fig. 2 is a side view of the same. Fig. 3 is a top view of the same. Fig. 4 is a central vertical section taken in the line .fr x of Fig. 3.

The exhaust-pipe A is of any suitable construction, and to its end is attached a frame, C, to which the working parts of the nozzle are attached. The adjustable nozzle consists of two shutters, B B, the inner surface of each of which is concave, and terminates in a semicircular outer edge, b, so that when the outer edges of the two shutters are placed together a circular opening is formed between them, as shown in Fig. 3. Each of the shutters 'B is connected to the frame O by two links, d d, one at each end of the shutter. The upper or outer end of the link is pivoted to the shutter, and the lower or inner end is pivoted to the side pieces of the frame G, near the endof the exhaust-pipe A, the shutters working laterally between the side pieces of the frame O.

The lower or inner edge of each shutter extends downward to about on a line with, or slightly below, the end of the exhaust-pipe A, where the corners are provided with pivots, c, extending outward on opposite sides beyond the side pieces of the frame C, transversely to the line of motion of the shutter, and fitting in notches f in said side pieces when the shutters are in a closed position. These pivots engage with the ends of cross-heads G, arranged one on each side of the frame C. rlhe lower portion of each cross-head is pivoted to the short arm of a lever, H, and the upper portion works in a guide, c'. The connection with the leveris made by means of a pin, g, on the cross-head, working in a'slot, ZL, in the lever. The levers H are rigidly connected with each other at their fulcrums by a bar, k, which formsthe pivot on which both levers oscillate, and by which means one long arm, l, 'serves for both levers. This long arm Z has its end connected with the cab by suitable connecting devices, so as to enable it to be operated by the engineer. On the inner sides of the shutters B, near the lower edges, are depressions or cavities m, as shown in Fig. 4,'Which enable the shutter to pass freely over the end of the exhaust-pipe A, and to fit closely thereon when'in the position shown in Fig. 4.

The operation of my invention is as follows: Power being applied to the long arm l, in the direction of the arrow in Fig. l, the cross-head G is moved downward, depressing the shutters B toward a vertical position, and causing their upper edges to separate and increase the diameter of the opening between them more or less according to the degree of motion communicated to the levers, Upon reversing the motion, the shutters B are made to rise and, by the operation of the linksd, to approach each other until their upper edges are in contact with each other, so as to reduce the diameter of the opening to its original dimensions, in which position the pivots c engage with the notches f, and prevent the possibility of displacement.

By this construction, arrangement,'and combination of the various parts, the engineer is enabled at pleasure to vary the dimensions of the exhaust-nozzle, and thus control the velocity of the exhaust steam, and regulate the draft and the steam-generating capacity, as substantially as and for the purpose shown before described. and described.

One of these adjustable nozzles may be zip- 2. The combination ofthe shutters B, crossplied to each cylinder, or the exhaust-pipes heads G, and levers H, substantially as and from both cylinders may be joined in one pipe, for the purpose shown and described. and the nozzle applied to the end of such pipe.

What I claim as new, and desire to secure by Letters Patent, :is- Witnesses:

l. The combination, With the exhaust-pipe MICHAEL RYAN,

A und frame C, of the shutters B and links d, BENJAMIN W. HOFFMAN.

GEORGE sEWnLL. 

